Stihl BT 45 - Pump Diaphragm and Fuel Strainer; Adjusting

28 BT 45
– Remove the carburetor - b 8.2.2
: Take out the screw (1).
: Remove the end cover (2).
VA
936RA032
2
1
: Remove the gasket (1).
VA
936RA033
1
: Remove the pump
diaphragm (1).
If the gasket and diaphragm are
stuck to the carburetor, remove and
separate them very carefully.
VA
936RA034
1
The diaphragm is a very delicate
component. As a result of the
alternating stresses the material
eventually shows signs of fatigue,
i.e. the diaphragm distorts and
swells and has to be replaced.
– Inspect the diaphragm and
gasket and replace if necessary.
: Examine the fuel strainer (1) for
contamination and damage and
replace if necessary.
Assemble in the reverse sequence.
VA
936RA086
1
The pump diaphragm (1),
gasket (2) are held in position by
pegs (arrows) on the end cover (3).
VA
932RA259
3
2
1
Standard setting
Do not remove the limiter cap from
the high speed screw (H) to carry
out the standard setting.
With this carburetor it is only
possible to correct the setting of the
VA
932RA330
L
H
LA
high speed screw (H) within fine
limits
– Check the air filter and replace if
necessary - b 8.1.1
– Check spark arrestor and clean
or replace as necessary - b 5.3
– Engage a gear.
8.4.5 Pump Diaphragm and
Fuel Strainer
8.4.6 Adjusting